18190320 has 40 divisors (see below), whose sum is σ = 56390736. Its totient is φ = 4850688.

The previous prime is 18190307. The next prime is 18190327. The reversal of 18190320 is 2309181.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18190327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37657 + ... + 38136.

Almost surely, 2^18190320 is an apocalyptic number.

18190320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18190320 is an abundant number, since it is smaller than the sum of its proper divisors (38200416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18190320 is a wasteful number, since it uses less digits than its factorization.

18190320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75809 (or 75803 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18190320 is about 4265.0111371484. The cubic root of 18190320 is about 262.9945687458.

The spelling of 18190320 in words is "eighteen million, one hundred ninety thousand, three hundred twenty".